EP0067675A2 - Positionsmessung - Google Patents

Positionsmessung Download PDF

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Publication number
EP0067675A2
EP0067675A2 EP82303010A EP82303010A EP0067675A2 EP 0067675 A2 EP0067675 A2 EP 0067675A2 EP 82303010 A EP82303010 A EP 82303010A EP 82303010 A EP82303010 A EP 82303010A EP 0067675 A2 EP0067675 A2 EP 0067675A2
Authority
EP
European Patent Office
Prior art keywords
tube
plumb
support tube
cable
upwardly extending
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82303010A
Other languages
English (en)
French (fr)
Other versions
EP0067675A3 (en
EP0067675B1 (de
Inventor
Peter Francis Roach
Christopher John Caldwell-Nichols
Alexander Thomson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Publication of EP0067675A2 publication Critical patent/EP0067675A2/de
Publication of EP0067675A3 publication Critical patent/EP0067675A3/en
Application granted granted Critical
Publication of EP0067675B1 publication Critical patent/EP0067675B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
    • G01C15/10—Plumb lines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
    • G01D5/2417—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying separation

Definitions

  • This invention relates to apparatus for the measurement of the movement of a member horizontally relative to a datum.
  • the invention has one application to the problem of horizontal movement measurement in relatively inaccessible and hostile locations such as in the core of a liquid metal cooled nuclear reactor.
  • the invention provides the title apparatus characterised in that said apparatus includes means for capacitatively resolving said horizontal movement from a measurement of the inclination of a plumb.
  • the invention preferably uses two pairs of orthogonally disposed electro- to relate the movement of the plumb, the plumb providing a part of the capacity ti ⁇ e system.
  • the electrodes may be provided by conductor elements of mineral insulated (MI) cables from which the outer sheath has been stripped over a limited length.
  • the cables may be located in helical grooving in a cable support tube (which is, in effect, the horizontally movable member), surrounding the plumb, with windows cut in the tube through which the stripped lengths of cable can "look" at the plumb.
  • the plumb preferably consists of a weighted flexible steel "energising" cable with the bob of the plumb located below the MT cable support tube but with a narrow metal tube upwardly extending from the bob to the energising cable so as to reach into the support tube and be viewable through the windows of the support tube.
  • figure 21a is a spective view of a support. tube in appartus of Figure1l; and Figure 3 is a plot of equi-potential lines in the cable support tube.
  • the elements fundamentally related to the invention are a cable support tube 10 (which is a member capable of horizoni 31 movement) and a plumb 11.
  • the plumb is supported on a tube 12 of smaller diameter than that of the plumb, and which consequently extends upwardly from the plumb.
  • the tube 12 reaches into the lower regions of the support tube 10 and forms the energised electrode of a capacitative measuring system.
  • a flexible electri- callty energised support cable 13 is attached to the tube 12.
  • the tube 10 has a centralising band 14(a) which typically fits into a-structure which may be subjected to horizontal movement in the course of its use. I t is this movement which requires to be measured and this movement is transmitted to the lower end of tube 10 which moves relative to the plumb.
  • a second centralising band 14(b) in effect laterally locates the plumb-line suspension point (by way of the tube 10) at the chosen datum on reference level.
  • the tube 10 as best seen in Figure 2, has 4-start helical grooves 20 and widows 21 disposed along parts of the grooves.
  • Mineral insulated cable 22 is laid in the grooves 20 and where it passes across the windows 21 the cable has had its outer sheath removed to expose bared conductors 23 which can be insulated with ceramic tubes.
  • the windows 21 are arranged in four groups each of five windows; one group for each groove 20 and each five window group extending over approximately 170° of arc as shown by the lines 30 of Figure 3.
  • the windows 21 are protected and screened on the outside by a thin sheet of stainless steel tack welded to the tube 10.
  • the cables 22 each form a capacitator-electrode at the respective group of five windows 21 to operate in conjunction with the energised electrode formed by tube 12.
  • the lines 30 form two pairs of orthogonally disposed electrodes to relate the movement of the tube 10 to the pl u m o 11.
  • the equi-potential lines between the electrode oairs ie lines of constant output from a differential amolifier fed from diagonal electrode pair are also shown in Figure 3 by the dash lines 31.
  • the plumb support cable 13 is carried in a tubu!ar head 40 located in a double eccentric bush 41 so that the horizontal position of the tube 12 can be adjusted relative to the tube 10.
  • a mineral insulated cable 42 passes through the bore of the head 40 to make electrical contact with the electrode (tube) 12 via the support cable 13.
  • the energised support cab!e 13 is electrically connected to the MI cable 42 in the vicinity of the bush 41.
  • An outer support tube 43 is shown passing through an access flange 44.
  • the tube 43 is carried by a support flange 45 sealed to the access flange at a ring seal 46.
  • the fiange 45 has four clands 47 through which pass respective mineral insulated cables 22 to enter helical grooving in the tube 43 and the grooves 20 of tube 10.
  • the cable 42 passes up tube 40 and then helically along a shielding boss 48 and emerges through a gland 49 in a flange 50 seaied to the flange 51 of a spield tube 52 at a ring seal
  • the apparatus can record oscillatory movements as well as nominally permanent deflections.
  • the use of the plumb 11 is suspended from the reactor roof which forms a reliable datum. It is capable of operation in temperatures of up to nearly 600°C.
  • the capacitative measuring system is well adapted for use in confined spaces. Suitable capacitative measuring techniques are known and in this respect reference may be had to an article by Walton in Transducer Technology Vol No 5 July/August 1979.
  • the "X" and "Y” pairs of electrodes (lines 30 in Figure 3) are connected to respective "X” and “Y” differential charge amplifiers and thence to meters.
  • the centre electrode (tube 12) is provided with an excitation alternating voltage and the relative movement of the electrode pairs with respect to the centre electrode appears as "X" and "Y” coordinates on the meters.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
EP82303010A 1981-06-17 1982-06-10 Positionsmessung Expired EP0067675B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8118635 1981-06-17
GB8118635 1981-06-17

Publications (3)

Publication Number Publication Date
EP0067675A2 true EP0067675A2 (de) 1982-12-22
EP0067675A3 EP0067675A3 (en) 1983-02-09
EP0067675B1 EP0067675B1 (de) 1985-12-04

Family

ID=10522570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82303010A Expired EP0067675B1 (de) 1981-06-17 1982-06-10 Positionsmessung

Country Status (4)

Country Link
US (1) US4507603A (de)
EP (1) EP0067675B1 (de)
JP (1) JPS589006A (de)
DE (1) DE3267770D1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4949467A (en) * 1988-10-03 1990-08-21 Robert Oman Inclinometer including an apparatus for maintaining a scientific and measuring instrument or the like in a level plane
US5406713A (en) * 1988-10-03 1995-04-18 Oman; Robert Apparatus for maintaining a scientific and measuring instrument or the like in a level plane
US5414677A (en) * 1994-02-09 1995-05-09 Feagin, Jr.; Loyd C. Ground movement sensor
FR2793317B1 (fr) * 1999-05-06 2001-07-13 Daniel Roux Dispositif de mesure de la variation de position entre deux referentiels de positionnement situes a des altitudes differentes
US7432657B2 (en) * 2005-06-30 2008-10-07 General Electric Company Ceramic lamp having shielded niobium end cap and systems and methods therewith

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE899561C (de) * 1943-09-04 1953-12-14 Aeg Einrichtung zum genauen Einstellen und zur laufenden UEberwachung der raeumlichen Lage, insbesondere der Senkrechten, mittels Pendels
FR2168056A1 (de) * 1972-01-12 1973-08-24 Russel Michael
US3997976A (en) * 1973-09-14 1976-12-21 Massachusetts Institute Of Technology Sensitive tiltmeter
US4241995A (en) * 1977-12-28 1980-12-30 Nippon Kogaku K.K. Apparatus for measuring amount of displacement

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2274735A (en) * 1938-10-18 1942-03-03 Melville F Peters Apparatus for determining the position of the conductor in electrical cables
US2633028A (en) * 1949-10-31 1953-03-31 Bendix Aviat Corp Pick-off device
US2604512A (en) * 1950-12-06 1952-07-22 Gen Electric Concentric tester
US2892152A (en) * 1953-09-22 1959-06-23 Buisson Pierre System for measuring small displacements of a body along three coordinate axes
FR1111036A (fr) * 1953-11-07 1956-02-21 Siemens Ag Dispositif pour le réglage de la grandeur de la boucle formée par un produit en forme de fil ou de bande en déplacement continu
US2825978A (en) * 1955-08-01 1958-03-11 Hoffman Electronics Corp Electromechanical sensing device
DE1490389A1 (de) * 1963-03-26 1969-05-22 Siemens Ag Anordnung zur Kontrolle der konzentrischen Lage von Leitern in Isolierstoffen
US3323699A (en) * 1965-10-04 1967-06-06 Allegheny Ludlum Steel Strip centerline sensor and control
US3555691A (en) * 1967-01-28 1971-01-19 Continental Elektro Ind Ag Clinometric pendulum apparatus
JPS6010245B2 (ja) * 1976-05-13 1985-03-15 株式会社明石製作所 岩盤計測用傾斜兼振動計

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE899561C (de) * 1943-09-04 1953-12-14 Aeg Einrichtung zum genauen Einstellen und zur laufenden UEberwachung der raeumlichen Lage, insbesondere der Senkrechten, mittels Pendels
FR2168056A1 (de) * 1972-01-12 1973-08-24 Russel Michael
US3997976A (en) * 1973-09-14 1976-12-21 Massachusetts Institute Of Technology Sensitive tiltmeter
US4241995A (en) * 1977-12-28 1980-12-30 Nippon Kogaku K.K. Apparatus for measuring amount of displacement

Also Published As

Publication number Publication date
JPS589006A (ja) 1983-01-19
EP0067675A3 (en) 1983-02-09
DE3267770D1 (en) 1986-01-16
US4507603A (en) 1985-03-26
EP0067675B1 (de) 1985-12-04

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